Inking mechanism for platen printing presses



' H. G. LEICHTWEISIS INKING MECHANISM FOR PLATEN PRINTING PRESSES Filed Dec. s, 1925 Patented Aug. 1Q,

UNITED STAT-ss .PATENT OFFICE.

HEINRICH GEORG LECHTWEISS, F DARMSTADT, GEB/MANY, ASSIGNOR TO GANDEN- BERGERSCHE MASCHINENFABRK, GEORG GOEBEL, OF DARMSTADT, GERMANY, A

CORPORATION OF GERMANY.

INKING -MECHANISM FOR i-LATEN PRINTING PRESSES.

Application filed December 8, 1925, Serial No. 74,086, and in Germany December 9, 19%.

it has been proposed in inking mechanisms for platen printing presses to move the distributing rollers in a closed lpath whether moved as a` carriage or by a chain or in the circuit on the printing stock or form. The known devices for this purpose have however the funda-mental disadvantage that their sphere of action is not sufficiently free.

According to the invention thedistributing rollers rest in rings laterally arranged on the printing press frame, supported by antifriction rollers and rotated by the machine. Through the open apertures of these rings runs the strip of paper to be printed upon. There are no spokes or other members to obstruct the space. The two rings are connected with o-ne another by stiffening members and the latter serve in a further development of the invention as carriers for the axially displaeeable supporting bodies of the distributing rollers.

The accompanying drawing diagrammatically illustrates by way of example one constructional form of the invention, wherein- Fig. 1 is a longitudinal section through a pla-ten printing press,

Fig. 2 a cross-section and Fig. 3 the arrangement of the distributing rollers in a roller frame.

Over the printing table or. platen 1 of a head printing press is guided in a known manner the strip of paper or the like 2 to be printed upon. The printing stocks or forms 3 are suspended in the printing head 4. The latter is moved up and down in the direction of the double-headed arrow 7 by means of two cranks 17 mounted on the main driving shaft 16 through the medium of connecting rods 5, which are pivoted to two draw-rods 6.

When the printing head 4t is in its highest position the inking of the forms 3 is effected by the group of distributing rollers 8. In order that the distributing rollers 8 may be able to adapt their main circulating movement determined by theroller frame l2 dur-- ing the inking of the forms 3 to the plane of the forms they are resiliently supported. The roller-carriers 9 are mounted as shown in Fig. 3 in such a way as to be transversely displaceable in clamps l0 in which they can be clamped by means of set screws 11 and can be laterally adjusted in, such a Way that their position corresponds to the position of the forms 3 in the printing head t. The setting or adjusting clamps 10 are rigidly connected with the two rings 12 which are arranged in ver ical planes at the sides of the frame walls of the printing press. The clamps 10 serve at the same time for the stiifening of' the roller frame thus con structed.

The rings 12 hang in carrying rollers 13 which are journalled on bolts 14 rigidly connected with the machine frame. The rings 12 are formed with external teeth in which two toothed wheels 15 engage. The latter are rigidly mounted on the main driving shaft 16. W7 hen the shaft 16 rotates, the rings 12 with their clamps 10 are therefore set in rotation, and with them the rollercarriers 9, together with the distributing rollers 8, either uniformly, or, by means not here illustrated, non-uniformly, in which case the distributing rollers 8 roll over the ink-supplying roller 18 for the purpose of taking ink therefrom.

The arrangement is so designed that the distributing rollers 8,' when the forms 3 lcome into contact with the strip of paper or the like 2 to be printed upon, are located outside the range of movement of the forms.

In order that the roller frame 12 may run at a low speed a` plurality of groups of distributing rollers may be journalled in one roller frame 12. The arrangement is then so designed that one of the groups of dis tributing rollers is always ready for inking when the form 3 rises. Fig. 2 shows by way of example a roller frame with two groups of rollers.

rlhe roller frame 12 may also be so arranged as to move round the printing head 4- instead of as illustrated in Figs. 1 and 2.

In order to enable rather long printing tables supported at a. number of points to be obtained for use with a large-sized paper and numerous forms a plurality of roller frames located side by side may be employed as indicated in Fig. 1.

What I clailn is l. Inkuing mechanism for platen printing presses, comprising a printing press frame, antifriction rollers mounted laterally on said frame, rings supported by said antifriction rollers, in such a position that the paper to be printed upon can pass through the central apertures thereof, drivingmeans for rotating said rings, and ink distributingl rollers mounted in said rings and adapted to move therewith in a circular' path.

2. Thiring mechanism for platen printing presses, Comprising aprinting` press iframe, antifriction rollers 1mounted laterally on said traine, rings supported by said antifrietion rollers, in such a position that the paper to be printed upon can pass through the central apertures thereof, longitudinal ystitlening stays rigidly connectingsaid rings with one another, driving' means for rotating said rings, and ink distributing rollers mounted in said rines and adapted to move therewith in a circular path.

3. linking; mechanism for platen printing presses, comprising a printing press traine, antifriction rollers mounted laterally on said frame, rings supported hy said antitrietion rollers, in such a position that the paper to be printed upon can pass through the central apertures thereof, longitudinal stiil'eni. stays rigidly connecting` said rings with one another, bearings longitudinally displaceable on said stays, driving means for rotating said rings, and inl: distributing rollers journalled in said bearings and adapted to move therewith in a Circular path.

t. lnling mechanism 'for platen printing presses, comprising a printing press frame, antitriction rollers mounted laterally on said trame, rings supported oy said antifriction rollers in such a position that the paper to he printed upon can pass through the central apertures thereof', longitudinal stiiliening stays rigidly connecting` said rings with one anouier, adjustable clamps longitudinally displaceable on said stays, levers mounted on said clamps, inlr distributing' 'rollers journalled on said levers, springs acting on said levers and tending' to press said ink distributing rollers outwards, and means for rotating' the rings.

ln testimony Wherot I have signed my name to this speciiieation.

HElNLiC/H GEORG LElGl-TWTEISFS. 

